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【多选题】
以下对脂肪酸的描述哪些正确( )A.
脂肪酸按其碳链长短可分为长链脂肪酸(14碳以上)
B.
脂肪酸按其碳链长短可分为中链脂肪酸（6—14碳）
C.
脂肪酸按其碳链长短可分为短链脂肪酸(5碳以下)
D.
按其饱和度可分为饱和脂肪酸，单不饱和脂肪酸
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举一反三
【单选题】Which is true according to the passage?
A.
The shop was on the Second Road.
B.
The boy was 18 years old.
C.
The boy was not in high spirit.
D.
The writer entered the shop by chance.
【简答题】caused the accident remains unknown.（That/What）A. What
【简答题】梯度方向为目标函数的最速上升方向, 方向为目标函数的最速下降方向,梯度具有局部性质,“某点”的梯度是该点极小邻域的最速方向,梯度矢量是函数等值线(面)的 (法或切)矢量。
【单选题】Since he and I both work in the same hospital, I can hardly avoid ____ him.
A.
to meet
B.
to have met
C.
having met
D.
meeting
【简答题】Both she and I ____watching TV when he came back. (was, were)
【简答题】What problem remains unsolved in the two Reconstructions? A) Differences between races are deliberately obscured. B) The blacks are not compensated for their unpaid labor. C) There is no guarantee for...
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